A072109 - cp's OEIS frontend

A072109 Numbers k such that Sum_{i=1..k} gcd(k,i) divides Sum_{i=1..k} lcm(k,i).

n	a(n)
1	1
2	4
3	36
4	125
5	469
6	536
7	882
8	1156
9	8532
10	8775
11	25012
12	32000
13	34749
14	36324
15	37179
16	61952
17	147456
18	405224
19	451584
20	644304
21	954084
22	1185921
23	1560546
24	1562500
25	1982464
26	3080025
27	5229378
28	5784025
29	6138868
30	9231327
31	12806144
32	22108500
33	25509168
34	25562264
35	29762208
36	40894464
37	45001899
38	47397636
39	49242375

[1, 4, 36, 125, 469, 536, 882, 1156, 8532, 8775, 25012, 32000, 34749, 36324, 37179, 61952, 147456, 405224, 451584, 644304, 954084, 1185921, 1560546, 1562500, 1982464, 3080025, 5229378, 5784025, 6138868, 9231327, 12806144, 22108500, 25509168, 25562264, 29762208, 40894464, 45001899, 47397636, 49242375]

cp's OEIS Frontend

A072109 Numbers k such that Sum_{i=1..k} gcd(k,i) divides Sum_{i=1..k} lcm(k,i).

Table of values

List of values